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� � � � � The disclosed method is a power management mechanism to reduce
the power consumption of the graphics-rendering pipeline by throttling its
throughput. As a result, the temperature of the hardware is reduced and a
catastrophic event is prevented.

� � � � � The disclosed method limits the processing engine, such
as the graphic rendering pipeline, to reduce the overall power consumption of
the system. The processing engine typically consumes most of the die area in an
integrated graphic product. If the processing engine is the dominant heat
source on the die, the disclosed method is the effective way to reduce the
power to lower the die temperature.

Advantages

� � � � � The disclosed method
provides advantages, including:

• � � � � Improved thermal performance due to
limiting heat production and preventing
the part from damaging itself

• � � � � Improved reliability
due to preventing a thermal virus

• � � � � Improved power performance due to saving power and enhancing battery life in
mobile chipsets

Detailed description

� � � � � The disclosed method is comprised of two portions:

• � � � � Throttle duty-cycle controller

• � � � � Operation controller

Throttle
duty-cycle controller

� � � � � The throttle duty cycle specifies the number of clocks within a
16-clock period in which data may be passed between the memory interface (local
cache) and the rendering pipeline. The throttling value is specified from 0 to
15. This value can be converted to the percentage of the duty cycle being
throttled, which is computed as (value * 100/16)%. Th...